<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Three框架</title>
    <script src="resources/three.js" data-ke-src="resources/three.js"></script>
    <style type="text/css">
        div#canvas-frame {
            border: none;
            cursor: pointer;
            width: 100%;
            height: 600px;
            background-color: #EEEEEE;
        }

    </style>
    <script>
        var renderer;
        function initThree() {
            width = document.getElementById('canvas-frame').clientWidth;
            height = document.getElementById('canvas-frame').clientHeight;
            renderer = new THREE.WebGLRenderer({
                antialias : true
            });
            renderer.setSize(width, height);
            document.getElementById('canvas-frame').appendChild(renderer.domElement);
            renderer.setClearColor(0xFFFFFF, 1.0);
        }

        var camera;
        function initCamera() {
            camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000);
            camera.position.x = 0;
            camera.position.y = 1000;
            camera.position.z = 0;
            camera.up.x = 0;
            camera.up.y = 0;
            camera.up.z = 1;
            camera.lookAt({
                x : 0,
                y : 0,
                z : 0
            });
        }

        var scene;
        function initScene() {
            scene = new THREE.Scene();
        }

        var light;
        function initLight() {
            light = new THREE.DirectionalLight(0xFF0000, 1.0, 0);
            light.position.set(100, 100, 200);
            scene.add(light);
        }

        var cube;
        function initObject() {

            var geometry = new THREE.Geometry();
            var material = new THREE.LineBasicMaterial( { vertexColors: THREE.VertexColors} );
            var color1 = new THREE.Color( 0x444444 ), color2 = new THREE.Color( 0xFF0000 );

            // 线的材质可以由2点的颜色决定
            var p1 = new THREE.Vector3( -100, 0, 100 );
            var p2 = new THREE.Vector3(  100, 0, -100 );
            geometry.vertices.push(p1);
            geometry.vertices.push(p2);
            geometry.colors.push( color1, color2 );

            var line = new THREE.Line( geometry, material, THREE.LinePieces );
            scene.add(line);
        }
        function render()
        {
            renderer.clear();
            renderer.render(scene, camera);
            requestAnimationFrame(render);
        }
        function threeStart() {
            initThree();
            initCamera();
            initScene();
            initLight();
            initObject();
            render();
        }

    </script>
</head>

<body onload="threeStart();">
<div id="canvas-frame"></div>
</body>
</html>
